Valence transitions in the heavy-fermion compound YbCuAl as a function of temperature and pressure

Yamaoka, H.; Tsujii, Naohito; Utsumi, Yuki; Sato, Hitoshi; Jarrige, Ignace; Yamamoto, Yoshiya; Lin, Jung‐Fu; Hiraoka, Nozomu; Ishii, Hirofumi; Tsuei, Ku Ding; Мizuki, J.

doi:10.1103/physrevb.87.205120

Cited by 28 publications

(27 citation statements)

References 41 publications

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“…In CeFe 2 Al 10 similar behavior as in CeRu 2 Al 10 is observed, but the change in the Ce valence is small above 12 GPa, where the transition from the Kondo to the valence fluctuation regions may occur as observed in Yb compounds [31,32]. Thus we conclude that CeRu 2 Al 10 is not located in the valence fluctuation region but rather in the Kondo region at ambient pressure [26].…”

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confidence: 71%

Correlation between the valence state of cerium and the magnetic transition inCe(Ru1−xFex)2Al

et al. 2014

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The correlation between the 4f -conduction electron (c-f ) hybridization and the transition temperature T 0 into the unconventional antiferromagnetically (AFM) ordered state in Ce(Ru 1−x Fe x ) 2 Al 10 has been investigated. The impact of pressure on the crystal structure and the electronic structure has been measured using x-ray diffraction and resonant x-ray emission spectroscopy at the Ce L 3 absorption edge in a diamond anvil cell. Our results show that the lattice spacings imply some correlation with the disappearance of T 0 . Analyses of the measured valence states, however, show only a weak correlation with the corresponding critical disappearance of the AFM order within experimental errors. Our results may be explained by a scenario based on the Kondo-Heisenberg model beyond the conventional Doniach phase diagram.

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confidence: 71%

Correlation between the valence state of cerium and the magnetic transition inCe(Ru1−xFex)2Al

et al. 2014

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“…The authors found that the slope of the valence-pressure curve v(P ) becomes more gradual at 9-11 GPa, comparable to P c . A similar change in the v(P ) curve near P c was also reported for YbNi 2 Ge 2 [10] and YbCuAl [11]. These experimental results suggest that the slope change is closely related to the QCP.…”

Section: Introductionsupporting

confidence: 84%

“…These experimental results suggest that the slope change is closely related to the QCP. The Yb valences in these compounds at 300 K are v ∼ 2.84 for YbCu 2 Si 2 [9], v ∼ 2.93 for YbNi 2 Ge 2 [10], and v ∼ 2.93 for YbCuAl [11] at ambient pressure, and shift to v ∼ 3 at high pressures for these compounds. Note that in these cases the Yb valence starts out already close to 3 at ambient pressure.…”

Section: Introductionmentioning

confidence: 90%

Pressure-induced valence change of YbNiGe3investigated by resonant x-ray emission spectroscopy at the YbL3edge

et al. 2014

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Pressure dependence of the Yb valence in YbNiGe 3 has been investigated up to 15.6 GPa at 300 K and up to 7.7 GPa at 17 K by means of x-ray absorption spectroscopy in Lα 1 partial fluorescence yield mode and resonant x-ray emission spectroscopy around the Yb L 3 absorption edge. The Yb valence in YbNiGe 3 at ambient pressure strongly fluctuates with the mean valence of v = 2.52 ± 0.01 at 300 K. The Yb valence rapidly changes toward a trivalent state with pressure up to ∼5 GPa, slowly increases up to ∼10 GPa, and then reaches a saturated value of v ∼ 2.87 at 15.6 GPa. The Yb valence at 17 K slightly decreases compared to that at 300 K; v ∼ 2.45 at ambient pressure and ∼2.72 at 7.7 GPa. We found that the pressure-induced change in the intensity of a quadrupole component in the x-ray absorption spectra shows the same trend as the Yb valence in YbNiGe 3. In contrast to YbNiGe 3 , the Yb valence in YbNiSi 3 is nearly 3 at ambient pressure with almost no temperature dependence.

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“…As reported in several papers studying Yb-valence in other materials, we observed a splitting of the Yb 3+ peak, which is likely due to the crystal field splitting of the unoccupied 5d-states. [21][22][23][24] Previous work measuring the valence of YbNiGa 4 and YbNiIn 4 was performed in transmission mode and lacked the resolution to fit both Yb 3+ peaks, resulting in a minor difference in the determined valence and pressure dependence thereof compared to the work reported herein. 6,7 Figure 4 shows the details of our fit for the ambient pressure data, as well as several XAS spectra at select pressures.…”

Section: X-ray Absorption Spectroscopymentioning

confidence: 99%

Pressure-dependent intermediate valence behavior in YbNiGa4 and YbNiIn4

et al. 2018

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We report a comprehensive structural and valence study of the intermediate valent materials YbNiGa4 and YbNiIn4 under pressures up to 60 GPa. YbNiGa4 undergoes a smooth volume contraction and shows steady increase in Yb-valence with pressure, though the Yb-valence reaches saturation around 25 GPa. In YbNiIn4, a change in pressure dependence of the volume and a peak in Yb-valence suggest a pressure induced electronic topological transition occurs around 10-14 GPa. In the pressure region where YbNiIn4 and YbNiGa4 possess similar Yb-Yb spacings the Yb-valence reveals a precipitous drop. This drop is not captured by density-functional-theory calculations and implies that both the lattice degrees of freedom and the chemical environment play an important role in establishing the valence of Yb. arXiv:1812.06074v1 [cond-mat.str-el]

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Valence transitions in the heavy-fermion compound YbCuAl as a function of temperature and pressure

Cited by 28 publications

References 41 publications

Correlation between the valence state of cerium and the magnetic transition inCe(Ru1−xFex)2Al

Correlation between the valence state of cerium and the magnetic transition inCe(Ru1−xFex)2Al

Pressure-induced valence change of YbNiGe3investigated by resonant x-ray emission spectroscopy at the YbL3edge

Pressure-dependent intermediate valence behavior in YbNiGa4 and YbNiIn4

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